Summary Geography: Mapwork and GIS

Mapwork
& GIS

, Mapwork
Direction
NNW N N - North NE - North East NNE - North North East
NNE
E - East SE - South East ENE - East North East
NW NE
S - South SW - South West ESE - East South East
WNW ENE
W - West NW - North West SSE - South South East
W E
SSW - South South West
WSW ESE WSW -West South West
SW SE WNW - West North West
SSW SSE
S NNW - North North West

Map code
15° 16° DRAW THE MAP CODE:



Ad B
27°
a b 2715AB
27 - Latitude

c 15 - Longitude
A - Big block



C D
B - Small block



28°

Bearing
- Measure with a protractor
- N = 0° / 360°
- E = 90°
- S = 180°
- W = 270°

Magnetic Bearing
STEPS
1. Difference in years
2. Annual change FORMULA
3. Mean Magnetic Declination (Given + step 2) MB = TB + MD
4. Magnetic bearing

Distance
REMEMBER: Use:
Distance: measurement x scale
Topographic: 1 : 50 000 K H D M D C M
unit
Orthophoto: 1 : 10 000

Gradient Distance: measurement x scale
Gradient = H1 - H2 unit
D - Always in metres
- Written in ratio form: 1:x